docker-minecraft-server/examples/docker-compose-forge.yml

version: "3.7"

services:
  mc:
    image: itzg/minecraft-server:java8
    ports:
    # expose the Minecraft server port outside of container
    - 25565:25565
    environment:
      # REQUIRED for all types
      EULA: "TRUE"
      # Set server type (vs the default of vanilla)
      TYPE: FORGE
    volumes:
    # use a named, managed volume for data volume
    - mc_forge:/data
    # attach local host directory "mods" in same directory as this compose file
    # all mods in this directory get copied into /data/mods at startup
    - ./mods:/mods:ro

volumes:
  # declared the named volume, but use default/local storage engine
  mc_forge: {}